$\left(x-y-z\right)^2$
$-9x+8=7x^{2}-6x^{2}-x+6$
$( 2 x - 3 x y ) ( 4 x ^ { 2 } + 6 x ^ { 2 } y + 9 x ^ { 2 } y ^ { 2 } )$
$8xe^3x$
$\frac{3}{4}=\frac{5}{x}-\frac{1}{2}$
$( 4 ) ^ { 3 } \sqrt { 81 x ^ { 3 } y ^ { 4 } }$
$4b+4b$
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